Upgrade Neuron SDK to 2.18.0 and TGI to 1.4.5 (fix)

[davidshtian]

What does this PR do?

• Upgrade Neuron SDK to 2.18.0
• Upgrade TGI from 1.4.1 to 1.4.5, otherwise the container image build "make neuronx-tgi" will fail, with the errors:

 => ERROR [builder 10/10] RUN cargo build --release --workspace --exclude benchmark                                                                     12.6s
 => [neuron  1/12] RUN apt-get update -y  && apt-get install -y --no-install-recommends     gnupg2     wget     && rm -rf /var/lib/apt/lists/*     &&   12.4s
 => [pyserver 1/7] RUN apt-get update -y  && apt-get install -y --no-install-recommends     make     python3-venv     && rm -rf /var/lib/apt/lists/*    12.4s
 => [neuron  2/12] RUN echo "deb https://apt.repos.neuron.amazonaws.com jammy main" > /etc/apt/sources.list.d/neuron.list                                0.3s
 => [pyserver 2/7] RUN install -d /pyserver                                                                                                              0.4s
------
 > [builder 10/10] RUN cargo build --release --workspace --exclude benchmark:
0.372 info: syncing channel updates for '1.75.0-x86_64-unknown-linux-gnu'
0.479 info: latest update on 2023-12-28, rust version 1.75.0 (82e1608df 2023-12-21)
0.502 info: downloading component 'clippy'
0.519 info: downloading component 'rustfmt'
0.544 info: installing component 'clippy'
0.802 info: installing component 'rustfmt'
1.134 warning: excluded package(s) `benchmark` not found in workspace `/usr/src`
1.316    Compiling text-generation-client v1.4.1 (/usr/src/router/client)
1.317    Compiling grpc-metadata v0.1.0 (/usr/src/router/grpc-metadata)
1.321    Compiling text-generation-router v1.4.1 (/usr/src/router)
1.322    Compiling text-generation-launcher v1.4.1 (/usr/src/launcher)
2.635    Compiling text-generation-benchmark v1.4.1 (/usr/src/benchmark)
3.734 error[E0432]: unresolved import `nix::sys::signal::Signal`
3.734  --> launcher/src/main.rs:2:30
3.734   |
3.734 2 | use nix::sys::signal::{self, Signal};
3.734   |                              ^^^^^^ no `Signal` in `sys::signal`
3.734   |
3.734   = help: consider importing this type alias instead:
3.734           ctrlc::Signal
3.734
3.735 error[E0432]: unresolved import `nix::unistd::Pid`
3.735    --> launcher/src/main.rs:3:5
3.735     |
3.735 3   | use nix::unistd::Pid;
3.735     |     ^^^^^^^^^^^^^^^^ no `Pid` in `unistd`
3.735     |
3.735 note: found an item that was configured out
3.735    --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/nix-0.27.1/src/unistd.rs:183:12
3.735     |
3.735 183 | pub struct Pid(pid_t);
3.735     |            ^^^
3.735     = note: the item is gated behind the `process` feature
3.735
3.750 error[E0425]: cannot find function `kill` in module `signal`
3.750     --> launcher/src/main.rs:1172:13
3.750      |
3.750 1172 |     signal::kill(Pid::from_raw(process.id() as i32), Signal::SIGTERM).unwrap();
3.750      |             ^^^^ not found in `signal`
3.750      |
3.750 note: found an item that was configured out
3.750     --> /usr/local/cargo/registry/src/index.crates.io-6f17d22bba15001f/nix-0.27.1/src/sys/signal.rs:974:8
3.750      |
3.750 974  | pub fn kill<T: Into<Option<Signal>>>(pid: Pid, signal: T) -> Result<()> {
3.750      |        ^^^^
3.750      = note: the item is gated behind the `signal` feature
3.750
4.020 Some errors have detailed explanations: E0425, E0432.
4.020 For more information about an error, try `rustc --explain E0425`.
4.026 error: could not compile `text-generation-launcher` (bin "text-generation-launcher") due to 3 previous errors
4.026 warning: build failed, waiting for other jobs to finish...
------
Dockerfile:42
--------------------
  40 |     COPY --from=tgi /tgi/router router
  41 |     COPY --from=tgi /tgi/launcher launcher
  42 | >>> RUN cargo build --release --workspace --exclude benchmark
  43 |
  44 |     # Python base image
--------------------
ERROR: failed to solve: process "/bin/sh -c cargo build --release --workspace --exclude benchmark" did not complete successfully: exit code: 101
make: *** [Makefile:46: neuronx-tgi] Error 1

Fixes # (issue)
Upgrade the version will fix the issue.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?

[dacorvo]

Thank you for this pull-request, which is almost perfect except it does not update optimum-neuron itself.
Please see our own pull-request to bump AWS Neuron SDK version.

[dacorvo]

See #547